Researchers Usually Test the Hypothesis $H _ { o } : \bar { x } _ { 1 } - \bar { x } _ { 2 } = 0$

True/False

Researchers usually test the hypothesis $H _ { o } : \bar { x } _ { 1 } - \bar { x } _ { 2 } = 0$ with an alternative hypothesis of $H _ { a } : \bar { x } _ { 1 } - \bar { x } _ { 2 } \neq 0$ rather than using a one-sided alternative.